US20050219464A1 - Semiconductor light-emitting device and video display adopting it - Google Patents

Semiconductor light-emitting device and video display adopting it Download PDF

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Publication number
US20050219464A1
US20050219464A1 US11/058,860 US5886005A US2005219464A1 US 20050219464 A1 US20050219464 A1 US 20050219464A1 US 5886005 A US5886005 A US 5886005A US 2005219464 A1 US2005219464 A1 US 2005219464A1
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United States
Prior art keywords
light
polarization
polarized light
light emitting
video display
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US11/058,860
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English (en)
Inventor
Futoshi Yamasaki
Masahiko Yatsu
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Hitachi Ltd
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Hitachi Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2073—Polarisers in the lamp house
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present invention relates to a video display technology for displaying video by irradiating light emitted from a light source to a video display device so as to thus form an optical image.
  • Japanese Unexamined Patent Application Publication No. 2003-329978 describes a structure used in a projection type display.
  • the structure employs LEDs that emit red, green, and blue color light waves respectively, and having a phase difference plate, a tapered rod lens array, a rod lens array, and a reflective sheet polarizer arranged outside the LEDs for the purpose of a compact, thin, and lightweight design.
  • Japanese Unexamined Patent Application Publication No. 2000-221596 describes a light source for projection type displays employing LEDs.
  • the light source includes a plurality of LEDs arranged on a plurality of inclined surfaces of a substrate, which reflects light, for the purpose of preventing interference of light waves emitted from adjoining LEDs.
  • the present invention can provide a video display technology for producing a thin light beam of parallel rays so as to ensure high image quality for displayed video, and for reducing the number of optical elements to be disposed on an optical path.
  • semiconductor light-emitting devices each having a flip-chip structure that a light-emitting diode (LED) chip light emitter are formed on a reflecting electrode.
  • the devices can be used as a light source in a video display.
  • Polarized light of white light, or color components of red, green, and blue light waves, wherein a first polarization is converted to become consistent with a second polarization is radiated from the light source.
  • a light transmissive substrate element turns a direction of polarization.
  • a reflective sheet polarizer element reflects one of P-polarized light or S-polarized light and transmits the other polarized light. These elements are disposed on the light-emitting side of the LED chip light emitter.
  • the light transmissive substrate (or quarter-wave phase difference plate) is used to turn the direction of polarization of polarized light, which is reflected from the reflective sheet polarizer or reflecting electrode, so that the direction of polarization will be aligned with the direction of polarization of the other polarized light.
  • the resultant polarized light is transmitted by the reflective sheet polarizer and then radiated.
  • the present invention provides a light source unit adopting the foregoing semiconductor light-emitting device incorporated in a video display.
  • An optical unit adopting the light source unit is also contemplated by the present invention.
  • high image quality video can be produced, and the number of optical elements disposed on an optical path can be reduced.
  • FIG. 1 illustrates the structure of a semiconductor light-emitting device in accordance with the first embodiment of the present invention
  • FIG. 2 illustrates the configuration of a video display adopting the semiconductor light-emitting device shown in FIG. 1 ;
  • FIG. 3 illustrates the configuration of a video display in accordance with the second embodiment of the present invention
  • FIG. 4 illustrates the configuration of a video display in accordance with the third embodiment of the present invention
  • FIG. 5 illustrates the configuration of a video display in accordance with the fourth embodiment of the present invention.
  • FIG. 6 illustrates the configuration of a semiconductor light-emitting device in accordance with the fifth embodiment of the present invention.
  • FIG. 1 and FIG. 2 are explanatory diagrams of the first embodiment of the present invention.
  • FIG. 1 illustrates the structure of a semiconductor light-emitting device in accordance with the present invention.
  • FIG. 2 illustrates the configuration of a video display adopting the semiconductor light-emitting device as a light source.
  • the semiconductor light-emitting device 1 comprises: an LED chip light emitter 1 a that emits white light, or any one of red, green, and blue light waves; a reflecting electrode 1 b ; a sapphire substrate 1 c serving as a light transmissive substrate that turns a direction of polarization of light; a reflective sheet polarizer 1 d that reflects one of P-polarized light (p wave, P-polarization) and S-polarized light (s wave, S-polarization) and transmits the other polarized light; a resin lens 1 r ; and a device substrate is.
  • the semiconductor light-emitting device 1 has a flip-chip structure that the LED chip light emitter 1 a is formed on the reflecting electrode 1 b.
  • the LED chip light emitter 1 a When a voltage is applied to the LED chip light emitter 1 a via the reflecting electrode 1 b , the LED chip light emitter 1 a emits light (either, white light, or any one of red, green, and blue light waves), and radiates the light towards the sapphire substrate 1 c .
  • the light includes P-polarized light and S-polarized light components.
  • One of the polarized light components (e.g., S-polarized light, FIG. 1 ) is reflected from the reflective sheet polarizer 1 d , passes back through the sapphire substrate 1 c , through the LED chip light emitter 1 a , and is incident on the reflecting electrode 1 b.
  • the incident light is reflected from the reflecting electrode 1 b , is through the LED chip light emitter 1 a again, passes through the sapphire substrate 1 c , and reaches the reflective sheet polarizer 1 d .
  • the polarization of the S-polarized light is rotated so as to be into P-polarized light.
  • Not all of the S-polarized light radiated from the LED chip light emitter 1 a may not be converted into P-polarized light during the first passage through the sapphire substrate 1 c after emission from the LED chip light emitter 1 a , during the second passage through the sapphire substrate 1 c after reflection from the reflective sheet polarizer 1 d , and during the third passage through the sapphire substrate 1 c after reflection from the reflecting electrode 1 b .
  • the remaining S-polarized light is further converted into P-polarized light during the passage through the sapphire substrate 1 c after reflection from the reflective sheet polarizer 1 d .
  • the remaining S-polarized light is further converted into P-polarized light during the passage through the sapphire substrate 1 c after reflection from the reflecting electrode 1 b .
  • the passage through the sapphire substrate 1 c is repeated so that the remaining S-polarized light can be converted into P-polarized light during the passages.
  • the P-polarized light resulting from conversion of the S-polarized light falls on the reflective sheet polarizer 1 d .
  • the P-polarized light propagates through the reflective sheet polarizer 1 d together with the P-polarized light component of the white light (or any of the red, green, and blue light waves) emitted from the LED chip light emitter 1 a .
  • the resultant P-polarized light is radiated to outside the device 1 via the resin lens Ir. Consequently, P-polarized light of white light or any of red, green, and blue light waves whose S-polarized light component is converted into P-polarized light is radiated from the semiconductor light-emitting device 1 .
  • the material of the reflective sheet polarizer 1 d is such that it transmits S-polarized light and reflects P-polarized light
  • the roles of the P-polarized light and the S-polarized light components described above are switched.
  • the P-polarized light is reflected from the reflective sheet polarizer 1 d , passes through the sapphire substrate 1 c , is transmitted by the LED chip light emitter 1 a , and then falls on the reflecting electrode 1 b .
  • the incident light is reflected from the reflecting electrode 1 b , is transmitted by the LED chip light emitter 1 a again, passes through the sapphire substrate 1 c , and reaches the reflective sheet polarizer 1 d .
  • the P-polarized light passes through the sapphire substrate 1 c after being reflected from the reflective sheet polarizer 1 d , and when the P-polarized light passes through the sapphire substrate 1 c again after being reflected from the reflecting electrode 1 b , the P-polarized light has the direction of polarization thereof turned so as to be thus converted into S-polarized light.
  • the P-polarized light radiated from the LED chip light emitter 1 a may not be converted into S-polarized light during the first passage through the sapphire substrate 1 c after emission from the LED chip light emitter 1 a , the second passage through the sapphire substrate 1 c after reflection from the reflective sheet polarizer 1 d , and the third passage through the sapphire substrate 1 c after reflection from the reflecting electrode 1 b .
  • the remaining P-polarized light is further converted into S-polarized light during the passage through the sapphire substrate 1 c after reflection from the reflective sheet polarizer 1 d .
  • the remaining P-polarized light is further converted into S-polarized light during the passage through the sapphire substrate 1 c after reflection from the reflecting electrode 1 b .
  • the passage through the sapphire substrate 1 c is repeated, and the remaining P-polarized light is duly converted into S-polarized light during the passages.
  • the S-polarized light that is produced by conversion of P-polarized light falls on the reflective sheet polarizer 1 d .
  • the S-polarized light is then transmitted by the reflective sheet polarizer 1 d together with the S-polarized light component of the white light or any of red, green, and blue light waves emitted from the LED chip light emitter 1 a .
  • the resultant S-polarized light is radiated to outside the device 1 via the resin lens 1 r . Consequently, S-polarized light of white light or any of red, green, and blue light waves whose P-polarized light component is converted into S-polarized light is radiated from the semiconductor light-emitting device 1 .
  • the foregoing structure adopts the sapphire substrate 1 c as a light transmissive substrate that turns the direction of polarization of light.
  • any other suitable substrate may be adopted.
  • FIG. 2 illustrates the configuration of a projection type video display in accordance with the first embodiment that adopts the semiconductor light-emitting device 1 shown in FIG. 1 as a light source.
  • the semiconductor light-emitting device can radiate polarized light of white light whose one polarized light component (e.g., P-polarized light) is converted to become consistent with the other polarized light component (e.g., S-polarized light).
  • the polarized light of white light that is radiated from the semiconductor light-emitting device is separated into polarized light waves of red, green, and blue light waves.
  • the polarized light waves of red, green, and blue light waves are then irradiated to associated video display devices (liquid-crystal panels) in order to form optical images.
  • the optical images are synthesized in terms of colors, and then enlarged and projected from a projection lens unit.
  • a projection type video display in accordance with the first embodiment comprises: a light source unit 100 having a plurality of semiconductor light-emitting devices 1 disposed on one plane; a first lens array 6 that comprises a plurality of microscopic lens cells and picks up a plurality of two-dimensional light source images; a second lens array 7 that comprises a plurality of microscopic lens cells and forms the images of the lenses constituting the first lens array 6 ; condenser lenses 9 ; reflecting mirrors 4 , 14 , 19 , and 20 ; dichroic mirrors 12 and 13 serving as a color separation means; relay lenses 15 , 16 , and 17 ; a red light condenser lens 10 R; a green light condenser lens 10 G; a red-light liquid-crystal panel 2 R; a green-light liquid-crystal panel 2 G; a blue-light liquid-crystal panel 2 B; a
  • the liquid-crystal panels 2 R, 2 G, and 2 B are driven by drive circuits in accordance with a video signal.
  • the liquid-crystal panels 2 R, 2 G, and 2 B each modulate incident polarized light and radiate resultant light.
  • the relay lenses 15 , 16 , and 17 are included for compensating for a magnitude by which an optical length from the light source unit 100 to the liquid crystal panel 2 B is larger than to the liquid crystal panels 2 R and 2 G.
  • the foregoing optical elements starting with the light source unit 100 to the projection lens unit 3 constitute an optical unit included in the projection type video display.
  • light emitted from the plurality of semiconductor light-emitting devices 1 constituting the light source unit 100 passes through the first lens array 7 , whereby a plurality of two-dimensional light source images is picked up. Thereafter, the second lens array 7 forms the plurality of two-dimensional light source images.
  • the image-bearing light falls on the condenser lens 9 .
  • the S-polarized light of white light concentrated on the condenser lens 9 is reflected from the reflecting mirror 4 , whereby the light path is bent substantially at right angles.
  • the S-polarized light falls on the dichroic mirror 12 at an angle of incidence of approximately 45°.
  • the dichroic mirror 12 transmits S-polarized light of red light contained in the white light but reflects S-polarized light waves of green and blue light waves.
  • the S-polarized light of red light transmitted by the dichroic mirror 12 is reflected from the reflecting mirror 19 . Consequently, the S-polarized light changes its path and passes through the condenser lens 10 R.
  • the S-polarized light is then converted into P-polarized light by a half-wave phase difference plate or the like.
  • the resultant P-polarized light is irradiated to the red-light transmissive liquid-crystal panel 2 R.
  • the P-polarized light of red light is modulated based on a video signal when being transmitted by the liquid-crystal panel 2 R.
  • the resultant light is radiated as S-polarized light of red light carrying an optical image from the liquid-crystal panel 2 R.
  • the S-polarized light of red light radiated from the liquid-crystal panel 2 R falls on the synthesizer prism 11 serving as a color synthesis means.
  • the S-polarized light of red light is reflected from a dichroic surface of the synthesizer prism 11 , and routed to the projection lens unit 3 .
  • the S-polarized light waves of green and blue light waves respectively reflected from the dichroic mirror 12 fall on the dichroic mirror 13 at an angle of incidence of approximately 45°.
  • the dichroic mirror 13 reflects the S-polarized light of green light, but transmits the S-polarized light of blue light.
  • the reflected S-polarized light of green light is irradiated to the green-light transmissive liquid-crystal panel 2 G via the condenser lens 10 G.
  • the S-polarized light of green light is modulated based on a video signal while being transmitted by the liquid-crystal panel 2 G.
  • the resultant light is radiated as P-polarized light of green light carrying an optical image from the liquid-crystal panel 2 G.
  • the P-polarized light of green light radiated from the liquid-crystal panel 2 G is transmitted by the dichroic surface of the synthesizer prism 11 , and then routed to the projection lens unit 3 .
  • the S-polarized light of blue light transmitted by the dichroic mirror 13 is reflected from the reflecting mirror 20 via the relay lens 15 , and further reflected from the reflecting mirror 14 via the relay lens 16 .
  • the S-polarized light is converted into P-polarized light by the half-wave phase difference plate or the like via the relay lens 17 .
  • the P-polarized light is irradiated to the blue-light transmissive liquid-crystal panel 2 B.
  • the P-polarized light of blue light is modulated based on a video signal when being transmitted by the liquid-crystal panel 2 B.
  • the resultant light is radiated as S-polarized light of blue light carrying an optical image from the liquid-crystal panel 2 B.
  • the S-polarized light of blue light radiated from the liquid-crystal panel 2 B falls on the synthesizer prism 11 .
  • the S-polarized light of blue light is then reflected from the dichroic surface of the synthesizer prism 11 and routed to the projection lens unit 3 .
  • the S-polarized light of red light, P-polarized light of green light, and S-polarized light of blue light that have been modulated based on the video signal are radiated from the synthesizer prism 22 while being synthesized in terms of colors.
  • the resultant light falls as white light on the projection lens unit 3 .
  • the projection lens unit 3 enlarges the white light and projects it as video light onto the screen 18 .
  • a thin light beam of parallel rays can be radiated from the light source unit 100 . Consequently, the image quality of displayed video improves.
  • the light source unit can be designed to be compact and lightweight. Because a polarized light converging means need not be disposed on a light path, the number of optical elements is reduced. This results in a compact optical system.
  • FIG. 3 illustrates the configuration of a projection type video display in accordance with the second embodiment of the present invention.
  • three kinds of semiconductor light-emitting devices that is, a kind of semiconductor light-emitting device that emits polarized light of red light whose one polarized light component is converted to become consistent with the other component, a kind of semiconductor light-emitting device that emits polarized light of green light whose one polarized light component is converted to become consistent with the other component, and a kind of semiconductor light-emitting device that emits polarized light of blue light whose one polarized light component is converted to become consistent with the other component are adopted as semiconductor light-emitting devices.
  • the fundamental structure of the semiconductor light-emitting devices is identical to that shown in FIG. 1 .
  • a semiconductor light-emitting device 1 R that emits polarized light of red light whose one polarized light component is converted to become consistent with the other component
  • a semiconductor light-emitting device 1 G that emits polarized light of green light whose one polarized light component is converted to become consistent with the other component
  • a semiconductor light-emitting device 1 B that emits polarized light of blue light whose one polarized light component is converted to become consistent with the other component.
  • a projection type video display in accordance with the second embodiment comprises: a red light source unit 100 R that has a plurality of semiconductor light-emitting devices 1 R disposed on one plane; a green light source unit 100 G that has a plurality of semiconductor light-emitting devices 1 G disposed on one plane; a blue light source unit 100 B that has a plurality of semiconductor light-emitting devices 1 B disposed on one plane; a first lens array 6 that comprises a plurality of microscopic lens cells and picks up a plurality of two-dimensional light source images; a second lens array 7 that comprises a plurality of microscopic lens cells and forms the images of the lens constituting the first lens array 6 ; condenser lenses 9 ; a red light condenser lens 10 R; a green light condenser lens 10 G; a blue light condenser lens 100 B; a red light transmissive liquid-crystal panel 2 R serving as a video display device; a green light transmissive liquid-crystal panel 2 G
  • the liquid-crystal panels 2 R, 2 G, and 2 B are driven by respective drive circuits according to a video signal.
  • the liquid-crystal panels 2 R, 2 G, and 2 B each modulate incident polarized light and radiates resultant light.
  • the above optical elements starting with the light source units 100 R, 100 G, and 100 B and ending with the projection lens unit 3 constitute an optical unit included in the projection type video display.
  • polarized light of red light of which one polarized component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 R constituting the red light source unit 100 R (P-polarized light or S-polarized light, for example, S-polarized light herein) passes through the first lens array 6 , whereby a plurality of two-dimensional light source images is picked up.
  • the second lens array 7 forms the plurality of two-dimensional light source images.
  • the image-bearing light falls on the condenser lens 9 .
  • the S-polarized light of red light concentrated on the condenser lens 9 passes through the condenser lens 10 R.
  • the P-polarized light of red light is converted into P-polarized light by a half-wave phase different plate or the like, the P-polarized light is irradiated to the red light transmissive liquid-crystal panel 2 R.
  • the P-polarized light of red light is modulated based on a video signal while being transmitted by the liquid-crystal panel 2 R, and radiated as S-polarized light of red light carrying an optical image.
  • the S-polarized light of red light radiated from the liquid-crystal panel 2 R falls on the cross-dichroic prism 26 serving as a color synthesis means.
  • the S-polarized light of red light is reflected from one dichroic surface of the cross-dichroic prism 26 and then routed to the projection lens unit 3 .
  • polarized light of green light of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 G constituting the green light source unit 100 G (P-polarized light or S-polarized light, for example, S-polarized light herein) passes through the first lens array 6 , whereby a plurality of two-dimensional light source images is picked up.
  • the second lens array 7 forms the plurality of two-dimensional light source images.
  • the image-bearing light falls on the condenser lens 9 .
  • the S-polarized light of green light concentrated on the condenser lens 9 is irradiated to the green light transmissive liquid-crystal panel 2 G via the condenser lens 10 G.
  • the S-polarized light of green light is modulated based on a video signal while being transmitted by the liquid-crystal panel 2 G, and then radiated as P-polarized light of green light carrying an optical image.
  • the P-polarized light of green light radiated from the liquid-crystal panel 2 G falls on the cross-dichroic prism 26 serving as a color synthesis means.
  • the P-polarized light of green light is transmitted by the cross-dichroic surface of the cross-dichroic prism 26 , and routed to the projection lens unit 3 .
  • polarized light of blue light of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 B constituting the blue light source unit 100 B (P-polarized light or S-polarized light, for example, S-polarized light herein) passes through the first lens array 6 , whereby a plurality of two-dimensional images is picked up.
  • the second lens array 7 forms the plurality of two-dimensional light source images.
  • the image-bearing light falls on the condenser lens 9 .
  • the S-polarized light of blue light concentrated on the condenser lens 9 passes through the condenser lens 10 B.
  • the P-polarized light is irradiated to the blue-light transmissive liquid-crystal panel 2 B.
  • the P-polarized light of blue light is modulated based on a video signal while being transmitted by the liquid-crystal panel 2 B, and radiated as S-polarized light of blue light carrying an optical image.
  • the S-polarized light of blue light radiated from the liquid crystal panel 2 B falls on the cross-dichroic prism 26 serving as a color synthesis means.
  • the S-polarized light of blue light is reflected by the cross-dichroic surface of the cross-dichroic prism 26 , and then routed to the projection lens unit 3 .
  • the S-polarized light of red light, P-polarized light of green light, and S-polarized light of blue light that are modulated based on the video signal are radiated from the cross-dichroic prism 26 while being synthesized with one another in terms of colors.
  • the resultant white light falls on the projection lens unit 3 .
  • the projection lens unit 3 enlarges the white light and projects it as video light onto the screen.
  • a thin light beam of parallel rays can be emitted from each of the red light source unit 100 R, green light source unit 100 G, and blue light source unit 100 B.
  • High-quality video can be displayed.
  • the light source units can be designed to be compact and lightweight.
  • the states of red, green, and blue light waves can be adjusted independently of one another. Consequently, the state of displayed video can be controlled finely.
  • a polarized light converging means other than the light source units, and a dichroic mirror or any other color separation means need not be disposed on a light path, the number of optical elements is reduced. Therefore, an optical system can be designed compactly and manufactured readily.
  • FIG. 4 illustrates the configuration of a projection type video display in accordance with the third embodiment of the present invention.
  • the third embodiment adopts three kinds of semiconductor light-emitting devices as semiconductor light-emitting devices included in light source units. Specifically, a kind of semiconductor light-emitting device that emits polarized light of red light whose one polarized light component is converted to become consistent with the other component, a kind of semiconductor light-emitting device that emits polarized light of green light whose one polarized light component is converted to become consistent with the other component, and a kind of semiconductor light-emitting device that emits polarized light of blue light whose one polarized light component is converted to become consistent with the other component are adopted.
  • polarized light waves of red, green, and blue light waves are radiated in a time-sharing manner, and irradiated to one video display device in order to form an optical image.
  • the fundamental structure of the semiconductor light-emitting devices is identical to that shown in FIG. 1 .
  • a semiconductor light-emitting device 1 R that emits polarized light of red light whose one polarized light component is converted to become consistent with the other component
  • a semiconductor light-emitting device 1 G that emits polarized light of green light whose one polarized light component is converted to become consistent with the other component
  • a semiconductor light-emitting device 1 B that emits polarized light of blue light whose one polarized light component is converted to become consistent with the other component.
  • a projection type video display in accordance with the third embodiment comprises: a red light source unit 100 R that has a plurality of semiconductor light-emitting devices 1 R disposed on one plane; a green light source unit 100 G that has a plurality of semiconductor light-emitting devices 1 G disposed on one plane; a blue light source unit 100 B that has a plurality of semiconductor light-emitting devices 1 B disposed on one plane; red light collimator lenses 80 R each of which recomposes light emitted from the semiconductor light-emitting device 1 R into light of parallel rays; green light collimator lenses 80 G each of which recomposes light emitted from the semiconductor light-emitting device 1 G into light of parallel rays; blue light collimator lenses 80 B each of which recomposes light emitted from the semiconductor light-emitting device 1 B into light of parallel rays; a cross-dichroic prism 26 that aligns the ray axes of red, green, and blue light waves with
  • the liquid-crystal panel 2 is driven by a drive circuit according to a video signal.
  • the liquid-crystal panel 2 modulates incident polarized light and emits resultant light.
  • the optical elements starting with the light source units 100 R, 100 G, and 100 B and ending with the projection lens unit 3 constitute an optical unit included in the projection type video display.
  • the plurality of semiconductor light-emitting devices 1 R constituting the red light source unit 100 R, the plurality of semiconductor light-emitting devices 1 G constituting the green light source unit 100 G, and the plurality of semiconductor light-emitting devices 1 B constituting the blue light source unit 100 B have their light emitting actions controlled so that they will emit polarized light waves of red, green, and blue light waves respectively in a time-sharing manner.
  • red light, green light, and blue light are emitted and radiated in sequential order.
  • polarized light of red light Assuming that red light is emitted, polarized light of red light, of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 R constituting the red light source unit 100 R (P-polarized light or S-polarized light, for example, S-polarized light herein) is recomposed into light of parallel rays by the red light collimator lens 80 R, and routed to the cross-dichroic prism 26 . In the cross-dichroic prism 26 , the S-polarized light of red light is reflected from one dichroic film 26 a and routed to the collimator lens 90 .
  • the S-polarized light of red light After the S-polarized light of red light is recomposed into light of parallel rays by the collimator lens 90 , it falls on the condenser lens 9 via the first lens array 6 and second lens array 7 .
  • the S-polarized light of red light concentrated on the condenser lens 9 is irradiated to the transmissive liquid-crystal panel 2 .
  • the S-polarized light of red light is modulated based on a video signal while being transmitted by the liquid-crystal panel 2 , and then radiated as P-polarized light of red light carrying an optical image.
  • the P-polarized light of red light radiated from the liquid-crystal panel 2 falls on the projection lens unit 3 .
  • polarized light of green light Assuming that green light is emitted, polarized light of green light, of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 G constituting the green light source unit 100 G (P-polarized light or S-polarized light, for example, S-polarized light herein) is recomposed into light of parallel rays by the green light collimator lens 80 G, and then routed to the cross-dichroic prism 26 . In the cross-dichroic prism 26 , the S-polarized light of green light is transmitted by dichroic films 26 a and 26 b and then routed to the collimator lens 90 .
  • the S-polarized light of green light is recomposed into light of parallel rays by the collimator lens 90 , and then irradiated to the transmissive liquid-crystal panel 2 via the first lens array 6 and second lens array 7 .
  • the S-polarized light of green light is modulated based on a video signal while being transmitted by the liquid-crystal panel 2 , and then radiated as P-polarized light of green light carrying an optical image.
  • the P-polarized light of green light radiated from the liquid-crystal panel 2 falls on the projection lens unit 3 .
  • polarized light of blue light of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 B constituting the blue light source unit 100 B (P-polarized light or S-polarized light, for example, S-polarized light herein) is recomposed into light of parallel rays by the blue light collimator lens 30 B and then routed to the cross-dichroic prism 26 .
  • the S-polarized light of blue light is reflected from the dichroic film 26 b and routed to the collimator lens 90 .
  • the S-polarized light of blur light is recomposed into light of parallel rays by the collimator lens 90 and then irradiated to the transmissive liquid-crystal panel 2 via the first lens array 6 , second lens array 7 , and condenser lens 9 .
  • the S-polarized light of blue light is modulated based on a video signal while being transmitted by the liquid-crystal panel 2 , and then radiated as P-polarized light of blue light carrying an optical image.
  • the P-polarized light of blue light radiated from the liquid-crystal panel 2 then falls on the projection lens unit 3 .
  • the projection lens unit 3 enlarges and projects the P-polarized light waves of red, green, and blue light waves. Consequently, video is displayed on the screen or the like.
  • a thin light beam can be emitted from each of the red light source unit 100 R, green light source unit 100 G, and blue light source unit 100 B. Consequently, high-quality video can be displayed.
  • the light source units can be designed to be compact and lightweight. The states of red, green, and blue light waves can be adjusted independently of one another. The state of displayed video can be finely controlled.
  • a polarized light converting means other than the light source units and a color separation means need not be disposed on a light path. Only one liquid-crystal panel 2 is used to construct a video display unit. Consequently, the number of optical elements is reduced. Eventually, an optical system can be designed compactly and manufactured readily.
  • FIG. 5 illustrates the configuration of a video display in accordance with the fourth embodiment of the present invention.
  • a kind of semiconductor light-emitting device that emits polarized light of red light whose one polarized light component is converted to become consistent with the other component a kind of semiconductor light-emitting device that emits polarized light of green light whose one polarized light component is converted to become consistent with the other component, and a kind of semiconductor light-emitting device that emits polarized light of blue light whose one polarized light component is converted to become consistent with the other component are adopted as semiconductor light-emitting devices to be included in light source units.
  • the polarized light waves of red, green, and blue light waves are emitted in a time-sharing manner, and video is displayed on a direct-vision type video display device.
  • the fundamental structure of the semiconductor light-emitting devices is identical to that shown in FIG. 1 .
  • FIG. 5 there are shown a semiconductor light-emitting device 1 R that emits polarized light of red light whose one polarized light component is converted to become consistent with the other component, a semiconductor light-emitting device 1 G that emits polarized light of green light whose one polarized light component is converted to become consistent with the other component, and a semiconductor light-emitting device 1 B that emits polarized light of blue light whose one polarized light component is converted to become consistent with the other component.
  • a video display in accordance with the fourth embodiment comprises: a red light source unit 100 R that has a plurality of semiconductor light-emitting devices 1 R disposed on one plane; a green light source unit 100 G that has a plurality of semiconductor light-emitting devices 1 G disposed on one plane; a blue light source unit 100 B that has a plurality of semiconductor light-emitting devices 1 B disposed on one plane; dichroic mirrors 22 and 23 ; and a direct-vision type display device 36 serving as a video display device.
  • the direct-vision type display device 36 is driven by a drive circuit according to video signals, and modulates incident polarized light so as to form an optical image.
  • the optical elements starting with the light source units 100 R, 100 G, and 100 B and ending with the direct-vision type display device 36 constitute an optical unit included in the video display.
  • the plurality of semiconductor light-emitting devices 1 R constituting the red light source unit 100 R, the plurality of semiconductor light-emitting devices 1 G constituting the green light source unit 100 G, and the plurality of semiconductor light-emitting devices 1 B constituting the blue light source unit 100 B have their light-emitting actions controlled so that they will emit polarized light waves of red, green, and blue light waves in a time-sharing manner. Even in the present embodiment, for example, red light, green light, and blue light are emitted and radiated in that order.
  • polarized light of red light Assuming that red light is emitted, polarized light of red light, of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 R constituting the red light source unit 100 R (P-polarized light or S-polarized light, for example, P-polarized light herein) is transmitted by the dichroic mirrors 22 and 23 and irradiated to the direct-vision type display device 36 .
  • the direct-vision type display device 36 modulates the P-polarized light of red light according to a video signal so as to form an optical image.
  • polarized light of green light Assuming that green light is emitted, polarized light of green light, of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting device 1 G constituting the green light source unit 100 G (P-polarized light or S-polarized light, for example, P-polarized light herein) is reflected from the dichroic mirror 22 and routed to the dichroic mirror 23 .
  • the incident P-polarized light of green light is transmitted by the dichroic mirror 23 and irradiated to the direct-vision type display device 36 .
  • the direct-vision type display device 36 modulates the P-polarized light of green light according to a video signal so as to form an optical image.
  • polarized light of blue light of which one polarized light component is converted to become consistent with the other component, emitted from the plurality of semiconductor light-emitting devices 1 B constituting the blue light source unit 100 B (P-polarized light or S-polarized light, for example, P-polarized light herein) is reflected from the dichroic mirror 23 and irradiated to the direct-vision type display device 36 .
  • the direct-vision type display device 36 modulates the P-polarized light of blue light according to a video signal so as to form an optical image.
  • the P-polarized light waves of red, green, and blue light waves are used to display video on the direct-vision display device 36 .
  • each of the red light source unit 100 R, green light source unit 100 G, and blue light source unit 100 B can emit a thin light beam. Consequently, high-quality video can be displayed.
  • the light source units can be designed to be compact and lightweight.
  • the states of red, green, and blue light waves can be adjusted independently of one another, and the state of displayed video can be controlled readily.
  • a polarized light converting means other than the light source units and a color synthesis means need not be disposed on a light path, and one direct-vision type display device 36 is used to realize a video display unit. Consequently, the number of optical elements can be reduced, and an optical system can be designed compactly.
  • FIG. 6 illustrates the configuration of a semiconductor light-emitting device in accordance with the fifth embodiment of the present invention.
  • a quarter-wave phase difference plate for turning the direction of polarization is disposed on the light-emitting side of an LED chip light emitter.
  • the semiconductor light-emitting device 1 ′ comprises: an LED chip light emitter 1 a that emits white light or any of red, green, and blue light waves; a reflecting electrode 1 b ; a light transmissive substrate 1 c ′ realized with a sapphire substrate or the like; a reflective sheet polarizer 1 d that reflects one of P-polarized light and S-polarized light and transmits the other polarized light; a quarter-wave phase difference plate 1 e that turns the direction of polarization of light; a resin lens 1 r ; and a device substrate 1 s .
  • the semiconductor light-emitting device 1 ′ has a flip-chip structure that the LED chip light emitter 1 a is formed on the reflecting electrode 1 b.
  • the LED chip light emitter 1 a when a voltage is applied to the LED chip light emitter 1 a through the reflecting electrode 1 b , the LED chip light emitter 1 a emits white light or any of red, green, and blue light waves towards the sapphire substrate 1 c .
  • One of the P-polarized and S-polarized light components of the emitted light passes through the substrate 1 c ′ and quarter-wave phase difference plate 1 e , is reflected from the reflective sheet polarizer 1 a , passes through the quarter-wave phase difference plate 1 e and substrate 1 c ′, is transmitted by the LED chip light emitter 1 a , and falls on the reflecting electrode 1 b .
  • the incident light is reflected from the reflecting electrode 1 b , is transmitted by the LED chip light emitter 1 a again, passes through both the substrate 1 c ′ and quarter-wave phase difference plate 1 e , and reaches the reflective sheet polarizer 1 d .
  • the S-polarized light passes through at least the quarter-wave phase difference plate 1 e after being reflected from the reflective sheet polarizer 1 d , and when the S-polarized light passes through the quarter-wave phase difference plate 1 e after being reflected from the reflecting electrode 1 b , the S-polarized light has the direction of polarization thereof turned and is thus converted into P-polarized light (p wave).
  • the whole of the S-polarized light (whole of an S-polarized light component of light emitting from the LED chip light emitter 1 a ) may not be converted into P-polarized light.
  • the remaining S-polarized light is further reflected from the reflective sheet polarizer 1 d , and converted into P-polarized light during the passage through the quarter-wave phase difference plate 1 e .
  • the remaining S-polarized light is further reflected from the reflecting electrode 1 b and converted into P-polarized light during the passage through the quarter-wave phase difference plate 1 e .
  • the remaining S-polarized light is converted into P-polarized light during the passages.
  • P-polarized light into which S-polarized light is converted during the passages through the quarter-wave phase difference plate 1 e falls on the reflective sheet polarizer 1 d .
  • the P-polarized light is transmitted by the reflective sheet polarizer 1 d together with the P-polarized light component of light emitted from the LED chip light emitter 1 a , and then radiated to outside the device 1 ′ via the resin lens 1 r . Consequently, P-polarized light of white light or any of red, green, and blue light waves whose S-polarized light component is converted into P-polarized light is radiated from the semiconductor light-emitting device 1 ′.
  • the reflective sheet polarizer 1 d transmits S-polarized light and reflects P-polarized light
  • the P-polarized light is reflected from the reflective sheet polarizer 1 d .
  • the P-polarized light passes through the quarter-wave phase difference plate 1 e and substrate 1 c ′, is transmitted by the LED chip light emitter 1 a , and then falls on the reflecting electrode 1 b .
  • the incident light is reflected from the reflecting electrode 1 b , is transmitted by the LED chip light emitter 1 a again, passes through the substrate 1 c ′ and quarter-wave phase difference plate 1 e , and then reaches the reflective sheet polarizer 1 d .
  • the P-polarized light passes through at least the quarter-wave phase difference plate 1 e after being reflected from the reflective sheet polarizer 1 d , and when the P-polarized light passes through the quarter-wave phase difference plate 1 e again after being reflected from the reflecting electrode 1 b , the P-polarized light has the direction of polarization thereof turned and is thus converted into S-polarized light (s wave).
  • the whole of the P-polarized light (whole of a P-polarized light component of light emitted from the LED chip light emitter 1 a ) may not be converted into S-polarized light.
  • the remaining P-polarized light is further reflected from the reflective sheet polarizer 1 d , and converted into S-polarized light during the passage through the quarter-wave phase difference plate 1 e .
  • the remaining P-polarized light is further reflected from the reflecting electrode 1 b , and converted into S-polarized light during the passage through the quarter-wave phase difference plate 1 e .
  • the remaining P-polarized light is duly converted into S-polarized light during the passages.
  • S-polarized light into which P-polarized light is converted during the passages through the quarter-wave sheet polarizer 1 e falls on the reflective sheet polarizer 1 d .
  • the S-polarized light is transmitted by the reflective sheet polarizer 1 d together with the S-polarized light component of light emitted from the LED chip light emitter 1 a , and then radiated to outside the device 1 ′ via the resin lens 1 r . Consequently, S-polarized light of white light or any of red, green, and blue light waves whose P-polarized light component is converted into S-polarized light is radiated from the semiconductor light-emitting device 1 ′.
  • FIG. 6 Even when the semiconductor light-emitting device 1 ′ shown in FIG. 6 is adapted to a light source unit, a video display and an optical unit similar to those shown in FIG. 2 , FIG. 3 , FIG. 4 , or FIG. 5 can be constructed. An operation and advantages to be provided are nearly identical to those described previously.
  • the first, second, and third embodiments have been described on the assumption that S-polarized light is radiated from a light source unit. Even when P-polarized light is radiated from the light source unit, a configuration, an operation, and advantages are nearly identical to those described previously.
  • the fourth embodiment has been described on the assumption that P-polarized light is radiated from a light source unit. Even when S-polarized light is radiated from the light source unit, a configuration, an operation, and advantages are nearly identical to those described previously.
  • a video display is not limited to a liquid-crystal panel.

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  • Engineering & Computer Science (AREA)
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  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Projection Apparatus (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Led Device Packages (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
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JP2004099206A JP2005284051A (ja) 2004-03-30 2004-03-30 半導体発光素子、それを用いた光源ユニット、光学ユニット及び映像表示装置

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US7806547B2 (en) 2006-07-14 2010-10-05 Light Prescriptions Innovators, Llc Brightness-enhancing film
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US20130038838A1 (en) * 2011-06-03 2013-02-14 Texas Instruments Incorporated Optically efficient polarized projector
US8393777B2 (en) 2005-07-28 2013-03-12 Light Prescriptions Innovators, Llc Etendue-conserving illumination-optics for backlights and frontlights
US8419232B2 (en) 2005-07-28 2013-04-16 Light Prescriptions Innovators, Llc Free-form lenticular optical elements and their application to condensers and headlamps
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US9477117B2 (en) 2013-07-24 2016-10-25 Samsung Display Co., Ltd. Optical lens module and backlight unit
US11579452B2 (en) * 2014-12-31 2023-02-14 3M Innovative Properties Company Compact polarized illuminators using reflective polarizers
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US7152985B2 (en) 2002-10-11 2006-12-26 Light Prescriptions Innovators, Llc Compact folded-optics illumination lens
US20040252390A1 (en) * 2002-10-11 2004-12-16 Light Prescriptions Innovators, Llc Compact folded-optics illumination lens
US7181378B2 (en) 2002-10-11 2007-02-20 Light Prescriptions Innovators, Llc Compact folded-optics illumination lens
US7070281B2 (en) * 2002-12-04 2006-07-04 Nec Viewtechnology, Ltd. Light source device and projection display
US20040109329A1 (en) * 2002-12-04 2004-06-10 Nec Viewtechnology, Ltd. Light source device and projection display
US7270425B2 (en) * 2002-12-26 2007-09-18 Sanyo Electric Co., Ltd. Projection type video display
US20060050245A1 (en) * 2002-12-26 2006-03-09 Sanyo Electric Co., Ltd. Projection type video display device
US7377671B2 (en) 2003-02-04 2008-05-27 Light Prescriptions Innovators, Llc Etendue-squeezing illumination optics
US20050088758A1 (en) * 2003-02-04 2005-04-28 Light Prescriptions Innovators, Llc, A Delaware Limited Liability Company Etendue-squeezing illumination optics
US7347599B2 (en) 2003-02-04 2008-03-25 Light Prescriptions Innovators, Llc Etendue-squeezing illumination optics
US8075147B2 (en) 2003-05-13 2011-12-13 Light Prescriptions Innovators, Llc Optical device for LED-based lamp
US7329029B2 (en) 2003-05-13 2008-02-12 Light Prescriptions Innovators, Llc Optical device for LED-based lamp
US7753561B2 (en) 2003-05-13 2010-07-13 Light Prescriptions Innovators, Llc Optical device for LED-based lamp
US7460985B2 (en) 2003-07-28 2008-12-02 Light Prescriptions Innovators, Llc Three-dimensional simultaneous multiple-surface method and free-form illumination-optics designed therefrom
US20050068504A1 (en) * 2003-09-30 2005-03-31 Arne Trollsch Device for homogeneous, multi-color illumination of a surface
US7101049B2 (en) * 2003-11-04 2006-09-05 Tamron Co., Ltd. Projector optics and projector with light source of LEDs
US20050128730A1 (en) * 2003-11-04 2005-06-16 Mikio Shindoh Projector optics and projector with light source of LEDs
US7144121B2 (en) * 2003-11-14 2006-12-05 Light Prescriptions Innovators, Llc Dichroic beam combiner utilizing blue LED with green phosphor
US20050117125A1 (en) * 2003-11-14 2005-06-02 Light Prescriptions Innovators, Llc Dichroic beam combiner utilizing blue LED with green phosphor
US8393777B2 (en) 2005-07-28 2013-03-12 Light Prescriptions Innovators, Llc Etendue-conserving illumination-optics for backlights and frontlights
US8419232B2 (en) 2005-07-28 2013-04-16 Light Prescriptions Innovators, Llc Free-form lenticular optical elements and their application to condensers and headlamps
US7806547B2 (en) 2006-07-14 2010-10-05 Light Prescriptions Innovators, Llc Brightness-enhancing film
US7798675B2 (en) 2006-08-11 2010-09-21 Light Prescriptions Innovators, Llc LED luminance-enhancement and color-mixing by rotationally multiplexed beam-combining
EP1942373A2 (en) 2007-01-05 2008-07-09 Hitachi, Ltd. Projection type display apparatus and optical unit
EP1942373A3 (en) * 2007-01-05 2008-08-06 Hitachi, Ltd. Projection type display apparatus and optical unit
US20090303707A1 (en) * 2008-06-04 2009-12-10 Delta Electronics, Inc. Light Source Transforming Apparatus and Light Source Apparatus Comprising the Same
US8192046B2 (en) * 2008-06-04 2012-06-05 Delta Electronics, Inc. Light source apparatus with color combining element
DE102009030549A1 (de) * 2009-06-25 2010-12-30 Osram Opto Semiconductors Gmbh Optisches Projektionsgerät
US8684540B2 (en) 2009-06-25 2014-04-01 Osram Opto Semiconductors Gmbh Optical projection apparatus
US20110187998A1 (en) * 2010-01-29 2011-08-04 Hitachi Consumer Electronics Co., Ltd. Projection type display apparatus
US8500285B2 (en) * 2010-01-29 2013-08-06 Hitachi Consumer Electronics Co., Ltd. Projection type display apparatus
US8657449B2 (en) 2010-01-29 2014-02-25 Hitachi Consumer Electronics Co., Ltd. Projection type display apparatus
US20130038838A1 (en) * 2011-06-03 2013-02-14 Texas Instruments Incorporated Optically efficient polarized projector
US9261764B2 (en) * 2011-06-03 2016-02-16 Texas Instruments Incorporated Optically efficient polarized projector
US20160131315A1 (en) * 2013-05-17 2016-05-12 Appotronics China Corporation Light-emitting device and stage lamp system
US10125927B2 (en) * 2013-05-17 2018-11-13 Appotronics China Corporation Light-emitting device and stage lamp system
US9477117B2 (en) 2013-07-24 2016-10-25 Samsung Display Co., Ltd. Optical lens module and backlight unit
US11579452B2 (en) * 2014-12-31 2023-02-14 3M Innovative Properties Company Compact polarized illuminators using reflective polarizers
US11960080B2 (en) * 2020-10-20 2024-04-16 Nippon Seiki Co., Ltd. Head-up display device

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GB0506437D0 (en) 2005-05-04
CN1677180A (zh) 2005-10-05
GB2413701A (en) 2005-11-02
JP2005284051A (ja) 2005-10-13

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